Constructs a Depot filled to the brim with gunpowder that boosts attack speed of nearby Units which use gunpowder. Will EXPLODE if destroyed, damaging ALL units.
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—In-game description
The Depot Wagon is a wagon in Age of Empires III: Definitive Edition - Knights of the Mediterranean that is unique to the Maltese and can only be shipped from the Home City. After sending the Gunpowder Mills card, every shipment will also include a free Depot Wagon. It builds a Depot for free and provides a speed boost to the attack of nearby gunpowder units. If the Depot is destroyed, it will explode, damaging and possibly killing all units (including allied units) around it.
Like most wagons, Depot Wagons provide a quick way of constructing building without spending resources. Depots can also be constructed by the Grand Master in 24 seconds for 60 wood, 60 coin. A Depot Wagon can do so in 8 seconds for free. If the Bailiff card has been sent, granting the Grand Master an aura that increases nearby building construction rate, they can build Depots in 16 seconds and 6 seconds respectively. This fast construction rate can prevent opponents from destroying the Depot before it has finished construction, allowing them to be placed more aggressively.
The aggressive placement of Depots has the benefit of making use of their large building multiplier upon destruction. From the Industrial Age onwards, Depots will destroy each other when placed closely together. This allows the player deal a lot of siege damage in a short time, similar to Petards, which the Maltese do not have access to. Although a single Depot Wagon will not assist much, the player may save a number of them to use at the same time.